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auth.go
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auth.go
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package jwtauth
import (
"context"
"time"
jwt "github.com/dgrijalva/jwt-go"
"github.com/gin-admin/gin-admin-tpl/pkg/auth"
)
const defaultKey = "gin-admin"
var defaultOptions = options{
tokenType: "Bearer",
expired: 7200,
signingMethod: jwt.SigningMethodHS512,
signingKey: []byte(defaultKey),
keyfunc: func(t *jwt.Token) (interface{}, error) {
if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, auth.ErrInvalidToken
}
return []byte(defaultKey), nil
},
}
type options struct {
signingMethod jwt.SigningMethod
signingKey interface{}
keyfunc jwt.Keyfunc
expired int
tokenType string
}
// Option 定义参数项
type Option func(*options)
// SetSigningMethod 设定签名方式
func SetSigningMethod(method jwt.SigningMethod) Option {
return func(o *options) {
o.signingMethod = method
}
}
// SetSigningKey 设定签名key
func SetSigningKey(key interface{}) Option {
return func(o *options) {
o.signingKey = key
}
}
// SetKeyfunc 设定验证key的回调函数
func SetKeyfunc(keyFunc jwt.Keyfunc) Option {
return func(o *options) {
o.keyfunc = keyFunc
}
}
// SetExpired 设定令牌过期时长(单位秒,默认7200)
func SetExpired(expired int) Option {
return func(o *options) {
o.expired = expired
}
}
// New 创建认证实例
func New(store Storer, opts ...Option) *JWTAuth {
o := defaultOptions
for _, opt := range opts {
opt(&o)
}
return &JWTAuth{
opts: &o,
store: store,
}
}
// JWTAuth jwt认证
type JWTAuth struct {
opts *options
store Storer
}
// GenerateToken 生成令牌
func (a *JWTAuth) GenerateToken(ctx context.Context, userID string) (auth.TokenInfo, error) {
now := time.Now()
expiresAt := now.Add(time.Duration(a.opts.expired) * time.Second).Unix()
token := jwt.NewWithClaims(a.opts.signingMethod, &jwt.StandardClaims{
IssuedAt: now.Unix(),
ExpiresAt: expiresAt,
NotBefore: now.Unix(),
Subject: userID,
})
tokenString, err := token.SignedString(a.opts.signingKey)
if err != nil {
return nil, err
}
tokenInfo := &tokenInfo{
ExpiresAt: expiresAt,
TokenType: a.opts.tokenType,
AccessToken: tokenString,
}
return tokenInfo, nil
}
// 解析令牌
func (a *JWTAuth) parseToken(tokenString string) (*jwt.StandardClaims, error) {
token, err := jwt.ParseWithClaims(tokenString, &jwt.StandardClaims{}, a.opts.keyfunc)
if err != nil || !token.Valid {
return nil, auth.ErrInvalidToken
}
return token.Claims.(*jwt.StandardClaims), nil
}
func (a *JWTAuth) callStore(fn func(Storer) error) error {
if store := a.store; store != nil {
return fn(store)
}
return nil
}
// DestroyToken 销毁令牌
func (a *JWTAuth) DestroyToken(ctx context.Context, tokenString string) error {
claims, err := a.parseToken(tokenString)
if err != nil {
return err
}
// 如果设定了存储,则将未过期的令牌放入
return a.callStore(func(store Storer) error {
expired := time.Unix(claims.ExpiresAt, 0).Sub(time.Now())
return store.Set(ctx, tokenString, expired)
})
}
// ParseUserID 解析用户ID
func (a *JWTAuth) ParseUserID(ctx context.Context, tokenString string) (string, error) {
if tokenString == "" {
return "", auth.ErrInvalidToken
}
claims, err := a.parseToken(tokenString)
if err != nil {
return "", err
}
err = a.callStore(func(store Storer) error {
if exists, err := store.Check(ctx, tokenString); err != nil {
return err
} else if exists {
return auth.ErrInvalidToken
}
return nil
})
if err != nil {
return "", err
}
return claims.Subject, nil
}
// Release 释放资源
func (a *JWTAuth) Release() error {
return a.callStore(func(store Storer) error {
return store.Close()
})
}